Df not updating after delete
Per pehrs, lsof L1 is probably the better way to go.
as Ignacio mentions, deleting the file won't free the space until you delete the processes that have open handles against that file.
It is a common practice among universities to provide their employee and students with university-based mail-boxes in domain registration.
If for some reason he stops the university and tries afterwards to get into Google Play, he experiences ''Error retrieving information from server [DF-CHARTA-01]" issue.
To delete the university account and start to use a new one is a way which suits no one.
Nevertheless, you can reclaim the space without killing the processes.
All you need to do is to remove the file descriptors.
The values of a dictionary can be of any type, but the keys must be of an immutable data type such as strings, numbers, or tuples.